Device for feeding fuel.



No? 826,792"; H PYATENTED JULY 24, 1906. J. MAGGORMAGK.

DEVICE FOR FEEDING FUEL. APPLICATION FILED mm. 11. 1905'.

7 xi A UNITED STATES" PATENT OFFICE. I

JOHN MAOGORMACK, OF BAYONNE, NEW JERSEY, ASSIGNOR'TO THE ENGINEER COMPANY,- A. CORPORATION OF NEW YORK.-

DEVICE FOR FEE'DING FUEL.

Specification of Letters Patent.

Patented July 24, 1906.

To all whom/it may concern;

Be it known that 1, JOHN MAoCoRMAoK, a citizen of the United States, residing at Ba- 7XTonne, in the county of Hudson and State of cw Jersey, have invented anew and useful Improvement in Devices for Feeding Fuel, of

when the following is a specification.

v This invention relates to improvements in an-aut'omatic device for feeding fuel into a furnace or for feeding masses of other material. I

In carrying out the present invention I have particularlyinview the provision of a mechanical stoker, whereby the fuel may be conveyed to the combustion-chamber of the furnace and forced or thrown onto the grate r grates in suchmanner that it will be evenly distributed over the body of the fire. I It is further my intention to provide a coalconveying mechanism which may be used in connection with a grate arranged either longitudinally or transversely of-the furnace.

M invention consistsin the construction,

com ination, and arrangement of parts as set forth in the appende claims.

In the accompanying drawings, wherein I haveshown one form of my inventiomsimilar characters of reference indicatelikepartsin both the views.

it Figure 1 is a view, partly in elevation and partly in section, showing the application of my improved stoker to a furnace. Fig. 2 is a transverse vertical sectional view taken upon the line-2 2 of Fig. 1. I

1 Referring now to the accompanying drawings in detail, theletter A indicates any suitab e furnace which is provided with any desired type of grate or grates, such as shown at 5. extending longitudinally of the grate a stoking magazine .6, which is in the nature of a re atively long trough U-shaped in cross-section, said trough being suspended between the grates in any suitable manner. In the accompan ing drawings I have shown the rear closed end 7 of the magazine-trough supported from the bridge-wall, while the front 8 of. such magazine abuts against the inner front wall 9 of the furnace. In connection with this magazine I em loy any preferred form of ho per, and in t e apparatusillustrated sucli hopper comprises a receiving portion 10, mounted upon the lower member ,and i the angle of the In the present instance I have shown l 1 1, which latter extends horizontally through the front wall of the furnace, as is shown at 12. This tubular portion 12 is practically a continuation of the magazine and may be so I considered.

The essential feature of my invention is the conveyer proper, which is in the nature: of a spiral screw, (indicated as an entirety by having its rear end 14 journa ed in the end wall 7 of the magazine and its frontend 15 similarly mounted in the front. wall 16 of the lower hopper member 11.

One of the well-known difficulties attending the use of screw stoking devices is the dif' ficulty of effecting the even feedin of the fuel throughout the entire length of t e magthe letterB.) Thisscrewin the present in- I stance is supported upon a s uareshaftt13,

azine. Referring to Fig. 1, it will be observed that inthe hopper the flightsform an angle with .the. axis of the screw which is greater than; fortyfive degrees and that in the trough or magazine. the flights form an angle with the axis of the screwwhich is substan tially forty-five degrees. The flights of the screw conveyer exert upon the fuel a force which may be resolved 1nto two forcesone parallel with the axis, which we may call a conveying? effort, and one at ri ht angles to the axis, which we may call a hftin effort. It will be readily understood vt at if the an le of the flights be greater than. substantia ly forty-five degrees the conveying effort exerted will exceed the lifting effort, while if the angle of the flights be substantially forty-five de rees the conveying and 'liftin efforts will. e approximately equal, flig ts be less than-for ty-five degrees the lifting effort will exceed 1 i the conveying efiort. It is desirable that in thehopper and itsextension through the furmace-Walls the conveying effort shall exceed the lifting effort, and conveyer-screws have heretofore been made in this form throughout their length; but I have discovered that the difliculty heretofore experienced in obtaining a uniform feeding action throughout the length of the magazine is greatly dimin: ished and may be substantially overcome by making the flights of the screw within the magazine of an angle which will afford a lifting effort at least equal to the conveyin effort, or, in other words, by making t ese' efiort and in which in the magazine the lifting eflort equals or exceeds theconveyinglef; fort. In the screw shown in the drawings theinitial,cOnveying fiights 19 19 are of the same pitch. They are followed by a flight of gradually-increasing pitch, while the liftingflights 20 and 21 are of the same pitch of aboutfbrty fivedegnees; InF'igiLIhaste-also shown: the diametenoii the flights decreasing toward the-rear end. of the screw,-. and thish have found. in general: to. be desirable, alrthough not essential, with screws construeted: as above-described. @thendifiicultzies heretofore experienced; with; screw. GOIl-Keyers;

lised inlfeeding fneli th-funnaees are the tend} eney toepack theifuel'; at. the bottom. 05 the magazine, the difliculty of: conveying large lumps-of fuelwithout, clogging theapparatus, and the liability of. hard substanoes--such= asslate, nails, spikes, and the like beingi caught between the edge of; hheflightsand. the wallsiofithe magazine. 'Eheseth'ingsnot onlyimposeabnormalistrainsonthemeohane ism. as well as the motor andi sometimeseree sult. in; breaking theparts, but they renderthe action: of the I conveyenuncertain-and-f unsatisfactory. Ii have discovered! that, these difficulties are to a.- great. extent, if not en tirely, overeome by providingltheedge-of: the

flights with indentations; 23;, the effect of which; is to-di'minishtheitendency to aek the fuel at the bQttom of themagazine, tobreak; ongrind upilarge lumps of, fuelztoisizes which;

canbeconVenienfly' conveyed; and act asliberating-spaces; to; permit. the: passage of; su h hardz substances. as, cannot be readily broken; as: nailsand the-like, and soprevent;

jamming; This-co titutes an independent. feature of improv ment; n the apparatus shewninthedrawingss ThQ:flightiSL9-5.2O9 and=21 areshownin-the rawings as mountediuponi a; sleeve 18, ene velopingshaft. 13 and? such sleeve maybe madeot atplurality QflSGGhiQIlSOIYmQy'bQ. eon,- tinuous, as-desired;

While-l; have hereim shown and: deseribedl one embodiment; of my invent/inn, L desire it. tolbelunderstood that; the:severalzfeatllresofi invention; are: not. limited to; the. for-ms. l severally shown, but. that; various modificartmnszand changes-may be madewithontdepanting the spirit of. my. invention and without exceeding the scope of my claims.

Having thusdescribed-my invention, what 1' I. claim is- 1. The combination with a furnace of a hopper, a. magazine and a screw conveyer, the screw-thread of which conveyer within 'the' hopper forms an angle of substantially more "than forty-five degrees with respect to the axis, and the screw-thread of which I of substantially forty five .degreesicr-lesswlth 1 respect; tothe-exis 28.1 The combination; with: a furnace, f: meansionfeeding: fuel; themtm. compr sing a magazine, and. a screw: armngedi th liein,hasnjingfindentedi flights to) diminish. the; strains; im osed;upon;theafiuelrfeeding'mechanism..

3; The combinaiienz. with; a. furnace; of. #meansfbrieedingfuel: thereto, comprising-at 1 magazine, a) serew therein; haying" flights; aft

1 flightsbeing indented. j 4-. The, combination with a. funnaee; ofi' meander-feeding fuel; thereto eom'p'nising a; magazine, a. serew therein; having fli hts; of: relatively different; diameten said; flig. tabs-- ing indentedi todiminishzthe-strainsimpnsed; "upon the fueL-feeding-meehanismi '5, The eombinatienwith aifunnaee, Qfi stroking meehanism,.comp.1ish1g:aloenveyingtrough! onmagazrne, having a hopper- Q0111? gmunicat-ing therewith, and; a; conveying and:

mounted. in. the. magazinerhediv,. a sleese en-- 'Veloping saidsshaflti, andiaepluralityofiindente ed; flights to. diminish: the strainszimpased, uponithefuelieeding- I eQhaDiII},.S8l dafi ght& being of! relatinely' difienenh diameter: and;.

pitch, spirally arranged abelitssaid; S fifivfiv H 6;. The combination. afurnanamfi a stoking' mechanisms. cemprising.- a; magazine, a, screw memben therefonhaving certain; flights: at. the-front. pnrtien. thereof; adapted-3 to push or feed the materialEtowardgthe-rean ofthemagazine, and; other. flightsadaptedito exert alifting influence; upon the matenali coming; from the firstrmentiened: flights to, distribute the. mateniall unifnrmly oven the himacegrate, theedgeseef sald'ifllghtsihavungg indentations-farmed therein; v J Witnesses:

HEN-Inf.- B3 Harem. R. B, Cavemen;

Frelatively different pitch, the edges of sai di.

conveyer within the magazine formsan angle feeding screw having a: shafitt rot-stably 

